Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94938aa0f467c7c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 04:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e866ab244d4d21a52d964666030d25ae SHA-1: 5750072abd8d751d99aa8c58dfac0a7f2465a288 SHA-256: e94938aa0f467c7c6777df086bcfce89e1ba0409c0cd8dc31eb25a479348c4c5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. This suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/fld53cacrqp1ou1m7ubc70jaag/kabejosexotur.pdf In PDF document text
    • https://faresaldabbous.com/uploads/files/63593420202.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/02aaa9978317b76eebe05c06119b30c9/gemafefuxumerezoze.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118b94339cc1---18597154893.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/43236008234.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/466810873.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/20895994975.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610640e135ea5---73173496460.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e43713738f8---41577952477.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/gamigagoguk.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/74739578305.pdfIn PDF document text
    • http://vertinu.lt/ckfinder/userfiles/files/61565637344.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/f7435kelvrbbgo0oinei6tunq2/38788049192.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/5536255974.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/90058916286.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/82ee010644cc2423368e4e424565eb79/49555946718.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/92328296813.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611e21d3e6cb7---32108799957.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6a41ce0aa---79323692328.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/bomugafuxasumovumi.pdfIn PDF document text
    • http://familiesforfamilies.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/musukexizawekidezogizimif.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/jexetiwideguwok.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/39d00e5b8fe5c088dc2f31d95b040989/genilubam.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/42395698582.pdfIn PDF document text
    • https://strechybenesov.cz/content/gogoxorezobonuwugodaveb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cst+studio+suite+getting+started+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB774 10724 bytes
SHA-256: 35bf358be7d6373d0a8c82548f7867c32225f0a02d149757137e1c760ce5b849
font_01_sfnt_off0000cfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE0 16844 bytes
SHA-256: 03012a1a7032ad7d167090966a0605220f2f200fcad4a4c72eac3489136fee1c
font_02_sfnt_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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